Breaker core



FIG. 1 is a top perspective view of the breaker core;

FIG. 2 is a bottom perspective view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof; and,

FIG. 5 is a side elevation view thereof. 

CLAIM The ornamental design for a breaker core, as shown and described. 